/*
 * Copyright 2011 J. Auer, J. Andert, F.-J. Jendrusch, U. Celebi
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.fuberlin.replication.storage;

import de.fuberlin.replication.library.Metadata;
import de.fuberlin.replication.library.Subset;

/**
 * Storage interface for replication metadata.
 */
public interface Storage {
	/**
	 * Increases the object version counter by one and returns the new object version.
	 * 
	 * @return the new object version.
	 */
	long getVersion();

	/**
	 * Returns the storage specific {@link Subset} Data Access Object (DAO) implementation.
	 * 
	 * @return the storage specific {@link Subset} Data Access Object (DAO) implementation.
	 * @see Subset
	 */
	SubsetDAO getSubsetDAO();

	/**
	 * Returns the storage specific {@link Metadata} Data Access Object (DAO) implementation.
	 * 
	 * @return the storage specific {@link Metadata} Data Access Object (DAO) implementation.
	 * @see Metadata
	 */
	MetadataDAO getMetadataDAO();

	/**
	 * Executes the given transaction.
	 * 
	 * @param transaction the transaction to be executed.
	 */
	void runTransactional(Transaction transaction);
}